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GET /api/patches/1022724/?format=api
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{
    "id": 1022724,
    "url": "http://patchwork.ozlabs.org/api/patches/1022724/?format=api",
    "web_url": "http://patchwork.ozlabs.org/project/intel-wired-lan/patch/20190110042157.8445-1-natechancellor@gmail.com/",
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    "date": "2019-01-10T04:21:57",
    "name": "iavf: Use printf instead of gnu_printf for iavf_debug_d",
    "commit_ref": null,
    "pull_url": null,
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    "archived": false,
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    "submitter": {
        "id": 73753,
        "url": "http://patchwork.ozlabs.org/api/people/73753/?format=api",
        "name": "Nathan Chancellor",
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        "username": "jtkirshe",
        "first_name": "Jeff",
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            "web_url": "http://patchwork.ozlabs.org/project/intel-wired-lan/list/?series=85287",
            "date": "2019-01-10T04:21:57",
            "name": "iavf: Use printf instead of gnu_printf for iavf_debug_d",
            "version": 1,
            "mbox": "http://patchwork.ozlabs.org/series/85287/mbox/"
        }
    ],
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    "check": "pending",
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        "From": "Nathan Chancellor <natechancellor@gmail.com>",
        "To": "Jeff Kirsher <jeffrey.t.kirsher@intel.com>",
        "Date": "Wed,  9 Jan 2019 21:21:57 -0700",
        "Message-Id": "<20190110042157.8445-1-natechancellor@gmail.com>",
        "X-Mailer": "git-send-email 2.20.1",
        "MIME-Version": "1.0",
        "X-Patchwork-Bot": "notify",
        "Subject": "[Intel-wired-lan] [PATCH] iavf: Use printf instead of gnu_printf\n\tfor iavf_debug_d",
        "X-BeenThere": "intel-wired-lan@osuosl.org",
        "X-Mailman-Version": "2.1.29",
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        "List-Id": "Intel Wired Ethernet Linux Kernel Driver Development\n\t<intel-wired-lan.osuosl.org>",
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        "Cc": "netdev@vger.kernel.org, Nick Desaulniers <ndesaulniers@google.com>,\n\tlinux-kernel@vger.kernel.org,\n\tMiguel Ojeda <miguel.ojeda.sandonis@gmail.com>, \n\tintel-wired-lan@lists.osuosl.org,\n\tNathan Chancellor <natechancellor@gmail.com>, \n\t\"David S. Miller\" <davem@davemloft.net>",
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        "Sender": "\"Intel-wired-lan\" <intel-wired-lan-bounces@osuosl.org>"
    },
    "content": "Clang warns:\n\nIn file included from drivers/net/ethernet/intel/iavf/iavf_main.c:4:\nIn file included from drivers/net/ethernet/intel/iavf/iavf.h:37:\nIn file included from drivers/net/ethernet/intel/iavf/iavf_type.h:8:\ndrivers/net/ethernet/intel/iavf/iavf_osdep.h:49:18: warning: 'format' attribute argument not supported: gnu_printf [-Wignored-attributes]\n        __attribute__ ((format(gnu_printf, 3, 4)));\n                        ^\n1 warning generated.\n\nWe can convert from gnu_printf to printf without any side effects for\ntwo reasons:\n\n1. All iavf_debug instances use standard printf formats, as pointed out\n   by Miguel Ojeda at the below link, meaning gnu_printf is not strictly\n   required.\n\n2. However, GCC has aliased printf to gnu_printf on Linux since at least\n   2010 based on git history.\n\n   From gcc/c-family/c-format.c:\n\n   /* Attributes such as \"printf\" are equivalent to those such as\n      \"gnu_printf\" unless this is overridden by a target.  */\n   static const target_ovr_attr gnu_target_overrides_format_attributes[] =\n   {\n     { \"gnu_printf\",   \"printf\" },\n     { \"gnu_scanf\",    \"scanf\" },\n     { \"gnu_strftime\", \"strftime\" },\n     { \"gnu_strfmon\",  \"strfmon\" },\n     { NULL,           NULL }\n   };\n\nThe mentioned override only happens on Windows (mingw32). Changing from\ngnu_printf to printf is a no-op for GCC and stops Clang from warning.\n\nLink: https://github.com/ClangBuiltLinux/linux/issues/111\nSuggested-by: Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>\nSigned-off-by: Nathan Chancellor <natechancellor@gmail.com>\n---\n drivers/net/ethernet/intel/iavf/iavf_osdep.h | 2 +-\n 1 file changed, 1 insertion(+), 1 deletion(-)",
    "diff": "diff --git a/drivers/net/ethernet/intel/iavf/iavf_osdep.h b/drivers/net/ethernet/intel/iavf/iavf_osdep.h\nindex e6e0b0328706..c90cafb526d0 100644\n--- a/drivers/net/ethernet/intel/iavf/iavf_osdep.h\n+++ b/drivers/net/ethernet/intel/iavf/iavf_osdep.h\n@@ -46,7 +46,7 @@ struct iavf_virt_mem {\n \n #define iavf_debug(h, m, s, ...)  iavf_debug_d(h, m, s, ##__VA_ARGS__)\n extern void iavf_debug_d(void *hw, u32 mask, char *fmt_str, ...)\n-\t__attribute__ ((format(gnu_printf, 3, 4)));\n+\t__printf(3, 4);\n \n typedef enum iavf_status_code iavf_status;\n #endif /* _IAVF_OSDEP_H_ */\n",
    "prefixes": []
}